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High-Tier Mission Battlefields first began being released in the December 2013 Version Update.
These battlefields bring back nostalgic enemies that have newfound strength to challenge even the most experienced veteran players. In order to challenge these foes, a key item is required by each party member to enter the battlefield.

It is highly suggested that you communicate with your party members to verify that everyone has purchased the appropriate key item required for the fight you are entering.
There is no warning if a party member is unable to enter the battlefield. If one player forgets to purchase the item, and the other party members enter, the player has a chance to purchase the key item as long as the other party members do not engage.

Key Item Sales

The following three NPCs sell the key items to enter the battlefields, one in each nation. Before you are allowed to buy the key item to enter the high level battlefield, you must meet the following requirements.

Difficulty

Initially, players are only able to choose Very Easy, Easy or Normal difficulties while beginning a fight for the first time.
After winning your first battle on these difficulties, you are then able to choose Difficult or Very Difficult the next time you enter the fight.

Note that if a fellow party member has already initialized the fight on either of the hardest two difficulties and you have not won the fight yet, the battlefield will still be set to the difficulty chosen by the party member that entered regardless of what you choose.